public URL getUrl(HttpServletRequest req) throws IOException {
String servletPath = req.getServletPath();
String selectedServerFullPath = getServerAddress(servletPath);
String queryString = req.getQueryString();
String newUrl = "";
HttpSession session = req.getSession(false);
newUrl = selectedServerFullPath + servletPath;
if (req.getRequestedSessionId() != null)
newUrl = newUrl + ";jsessionid=" + req.getRequestedSessionId();
if (queryString != null) newUrl = newUrl + "?" + queryString;
// if (session != null) newUrl = newUrl + ";jsessionid=" + session.getId();
return new URL(newUrl);
}